Question

如何将nsdocument从ipad / iphone同步到带有icloud的Mac osx

我设法让它发挥作用！从Mac osx到iPhone / iPad，但不是从iPad / iPhone到Mac osx

我的代码来自nsdocument上的子osx文件的代码：

标题文件：

#import <Cocoa/Cocoa.h>
#import <Foundation/Foundation.h>

@interface subclassedNSDocument : NSDocument

@property (strong) NSData *myData;

@end

实施档案：

- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError 
{
    BOOL readSuccess = NO;
    if (data) 
    {
        readSuccess = YES;
        [self setMyData:data];
    }

    [[NSNotificationCenter defaultCenter] postNotificationName:@"dataModified" 
                                                        object:self];

    return readSuccess;
}

- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError 
{
    if (!myData && outError) {
        *outError = [NSError errorWithDomain:NSCocoaErrorDomain
                                        code:NSFileWriteUnknownError userInfo:nil];
    }
    return myData;
}

并在AppDelegate.m文件中：

#define kFILENAME @"mydocument.dox"

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    NSURL *ubiq = [[NSFileManager defaultManager] 
                   URLForUbiquityContainerIdentifier:nil];
    if (ubiq) {
        NSLog(@"iCloud access at %@", ubiq);
        // TODO: Load document... 
        [self loadDocument];
    }
    else 
    {
        NSLog(@"No iCloud access");
    }

    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(dataReloaded:) 
                                                 name:@"dataModified" object:nil];
}

- (void)update_iCloud
{
    NSURL *ubiq = [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];
    NSURL *ubiquitousPackage = [[ubiq URLByAppendingPathComponent:@"Documents"] URLByAppendingPathComponent:kFILENAME];
    self.doc.myData = [NSKeyedArchiver archivedDataWithRootObject:[@"Your Data Array or any data", nil]];
    [self.doc saveToURL:ubiquitousPackage ofType:@"dox" forSaveOperation:NSSaveOperation error:nil];
}

- (void)loadData:(NSMetadataQuery *)query {

    if ([query resultCount] == 1) {

        NSMetadataItem *item = [query resultAtIndex:0];
        NSURL *url = [item valueForAttribute:NSMetadataItemURLKey];
        NSLog(@"url = %@",url);
        subclassedNSDocument *doc = [[subclassedNSDocument alloc] initWithContentsOfURL:url ofType:@"dox" error:nil];
        [doc setFileURL:url];
        self.doc = doc;
    } 
    else {

        NSURL *ubiq = [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];
        NSURL *ubiquitousPackage = [[ubiq URLByAppendingPathComponent:@"Documents"] URLByAppendingPathComponent:kFILENAME];

        dataUrls *doc = [[dataUrls alloc] init];
        [self.doc setFileURL:ubiquitousPackage];
        self.doc = doc;
        [self.doc saveToURL:ubiquitousPackage ofType:@"dox" forSaveOperation:NSSaveOperation error:nil];
    }

}

- (void)queryDidFinishGathering:(NSNotification *)notification {

    NSMetadataQuery *query = [notification object];
    [query disableUpdates];
    [query stopQuery];

    [[NSNotificationCenter defaultCenter] removeObserver:self 
                                                    name:NSMetadataQueryDidFinishGatheringNotification
                                                  object:query];

    _query = nil;

    [self loadData:query];

}

- (void)loadDocument {

    NSMetadataQuery *query = [[NSMetadataQuery alloc] init];
    _query = query;
    [query setSearchScopes:[NSArray arrayWithObject:NSMetadataQueryUbiquitousDocumentsScope]];
    NSPredicate *pred = [NSPredicate predicateWithFormat: @"%K == %@", NSMetadataItemFSNameKey, kFILENAME];
    [query setPredicate:pred];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(queryDidFinishGathering:) name:NSMetadataQueryDidFinishGatheringNotification object:query];

    [query startQuery];

}

- (void)dataReloaded:(NSNotification *)notification 
{
    self.doc = notification.object;

    NSArray *arrFromCloud = [NSKeyedUnarchiver unarchiveObjectWithData:self.doc.myData];

    //Update you UI with new data
}

问题是： 我唯一没有工作的是，如果我在iPad上更改文档的数据，Mac应用程序不会调用readFromData方法从iCloud更新，是否有人知道我错过了什么吗？

在iOS上，iCloud中loadFromContents的每次更改都会自动调用等效方法UIDocument。在OS X上，readFromData在加载时被调用一次但从未再次被调用。

希望我的代码可以提供帮助，对我来说，它是从Mac到iPad的单向工作。

Answer 1

自己修正了。

显然，这只是一个执行不佳且过于复杂的示例代码。

在applicationDidFinishLaunching:我们只需要

_query = [[NSMetadataQuery alloc] init];
[_query setSearchScopes:[NSArray arrayWithObject:NSMetadataQueryUbiquitousDocumentsScope]];
NSPredicate *pred = [NSPredicate predicateWithFormat: @"%K == %@", NSMetadataItemFSNameKey, kFILENAME];
[_query setPredicate:pred];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(queryUpdated:) name:NSMetadataQueryDidUpdateNotification object:_query];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(queryUpdated:) name:NSMetadataQueryDidFinishGatheringNotification object:_query];
[_query startQuery];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(dataReloaded:) name:@"dataModified" object:nil];

并添加以下方法：

- (void)queryUpdated:(NSNotification *)notification {
    NSLog(@"queryUpdated called...");
    NSMetadataQuery *query = [notification object];
    [query disableUpdates];

    if ([query resultCount] == 1) {
        // update views, etc. here
    }

    [query enableUpdates];
}

然后从原始样本中删除所有未调用的方法。

如何使用iCloud将NSDocument从iPad / iPhone同步到Mac osx

1 个答案: